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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Impacts of Adopting IFRS 15 in Consolidated Statements of Income and Comprehensive Income (Loss) (Detail) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Net income |  |
Gross revenue | $ 4,283.8 | $ 4,028.7
Subconsultant/subcontractor and other direct expenses | 928.6 | 854.9
Total income taxes | 55.0 | 166.5
Net income for the year from continuing operations | 171.3 | 97.0
Net loss from discontinued operation, net of tax | (123.9) |
Net income for the year | 47.4 | 97.0
Comprehensive income |  |
Exchange differences on translation of foreign operations | 124.1 | (134.1)
Other comprehensive income for the year, net of tax | 114.5 | (117.8)
Total comprehensive income (loss) for the year, net of tax | $ 161.9 | $ (20.8)
Earnings per share, basic and diluted |  |
Continuing operations | $ 1.51 | $ 0.85
Discontinued operations | (1.09) |
Total basic and diluted earnings per share | $ 0.42 | $ 0.85
Previously stated [member] |  |
Net income |  |
Gross revenue | $ 4,287.9 |
Subconsultant/subcontractor and other direct expenses | 937.1 |
Total income taxes | 53.8 |
Net income for the year from continuing operations | 168.1 |
Net loss from discontinued operation, net of tax | (146.9) |
Net income for the year | 21.2 |
Comprehensive income |  |
Exchange differences on translation of foreign operations | 124.7 |
Other comprehensive income for the year, net of tax | 115.1 |
Total comprehensive income (loss) for the year, net of tax | $ 136.3 |
Earnings per share, basic and diluted |  |
Continuing operations | $ 1.48 |
Discontinued operations | (1.29) |
Total basic and diluted earnings per share | $ 0.19 |
Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |
Net income |  |
Gross revenue | $ (4.1) |
Subconsultant/subcontractor and other direct expenses | (8.5) |
Total income taxes | 1.2 |
Net income for the year from continuing operations | 3.2 |
Net loss from discontinued operation, net of tax | 23.0 |
Net income for the year | 26.2 |
Comprehensive income |  |
Exchange differences on translation of foreign operations | (0.6) |
Other comprehensive income for the year, net of tax | (0.6) |
Total comprehensive income (loss) for the year, net of tax | $ 25.6 |
Earnings per share, basic and diluted |  |
Continuing operations | $ 0.03 |
Discontinued operations | 0.20 |
Total basic and diluted earnings per share | $ 0.23 |

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